STS simulator

Short Description

Measurement of the Time Interval Error (TIE) of a simulates signal of synchronization

• Calculation of the following signal parameters, derived from the TIE raw data:
• MTIE
• ADEV
• MADEV
• TDEV
• Δf/fo

Simulates signal of synchronization according to pseudorandom rule. It allows to play short pieces of real signals stored in the memory of device.

Work with the device

Work with the device is accomplished via regular control program via WinSTS. Simulator supports all functions of regular OSA5565STS device. Signal of synchronization for the simulator is generated inside device via pseudorandom law. Additionally there is possibility to playback real signals of synchronization previously recorded to the memory of device. To replay signals from memory of simulator, according to paragraph 7.4.3 of WinSTS Rev.3.0 description, you need to download one of avaliable device configurations Config1-Config6. After choosing Config0 regular mode of simulator is switched on - pseudorandom signal generation. Config1-Config6 - playback from memory of device. By default the simulator has six real signals of synchronization for demonstration. Previously saved or specially prepared signals can be downloaded independently into memory of device by connecting simulator via regular USB cable to computer. At the same time simulator is seen as ordinary disc (8 MB size). With this simulator it's possible to replay any signals of synchronization previously saved in real device with maximal resolution 12,5 msec.

The simulator can be calibrated as real device via digi-switches on the front board. In this simulator also there is function of imitation of Earth's magnetic field, that affects measurements if simulator is arranged at different angle relative to the ground. If simulator is correctly calibrated deviation of virtual inside rubidium almost equal zero.

Digi-switches

The digi-switches adjust the fractional frequency of the internal clock with the steps shown in the following table (Δy/step).

• HSB upper digi-switch 2.5E-10
• MSB mid digi-switch 1.6E-11
• LSB lower digi-switch 1E-12

If the TIE vs. t curve shows a negative slope, then turn the digi-switches anticlockwise; if

the TIE vs. t curve shows a positive slope, turn the digi-switches clockwise.

Сalibration

In the main window WInSTS, set the following values in the sample and rate edit boxes and click on the ‘Start’ button:

• Sample = 10000
• Rate = 1s

Observing the TIE[s] versus t[s] graph, adjust the three digi-switches on the SIM module until the curve becomes horizontal. For more details see section 6.1 Rubidium Clock Frequency.

Purpose

For educational institutions, telecommunication speciality. It allows to obtain skills of configuration and calibration, measurement and evaluation of results.

Download

For device control click link for downloading WinSTS Rev3.0 control program with User Guide.

• User Guide WinSTS Rev.3.0
• WinSTS 3.0

Contacts

For more specific information contact fop.mira@outlook.com